<main class="container">
  <section class="slide parallax" id="slide1">
    <h1>Pure CSS Parallax</h1>
  </section>
  <section class="slide" id="slide2">
    <h1>Set to full page for best experience.</h1>
  </section>
  <section class="slide parallax" id="slide3">
    <h1>No JavaScript Required</h1>
  </section>
  <section class="slide" id="slide4">
    <h1>End</h1>
  </section>
</main>
